Exhaust system, and engine device and vehicle with the same
First Claim
1. An exhaust system for exhausting gas from a plurality of cylinders of an engine, the exhaust system comprising:
- a plurality of first exhaust pipes corresponding in number to the plurality of cylinders, into which the gas exhausted from the plurality of cylinders flows, respectively;
a first catalyst device having a first catalyst that cleanses the gas introduced from the plurality of first exhaust pipes;
a first assembler arranged to assemble and couple first ends of the plurality of first exhaust pipes to the first catalyst device;
a plurality of first inflow portions provided at the first assembler that allow the gas exhausted from the plurality of first exhaust pipes to flow into the first catalyst device;
a first detector provided in only one of the plurality of first exhaust pipes or only one of the plurality of first inflow portions and arranged to detect the information about an oxygen concentration of the gas exhausted from only a respective one of the plurality of cylinders; and
a controller that controls the amounts of fuel injected in the plurality of cylinders, based on the information about the oxygen concentration detected by the first detector;
whereinthe first assembler is connected to the first catalyst device such that the plurality of first inflow portions are not in communication with each other;
the first exhaust pipe or the first inflow portion provided with the first detector is connected to the cylinder in which the amount of injected fuel is the closest to an average of the amounts of fuel injected in the plurality of cylinders; and
the controller calculates the air-fuel ratio in the cylinder in which the amount of injected fuel is the closest to the average amount based on the information about the oxygen concentration detected by the first detector, and controls the amounts of fuel injected in the plurality of cylinders based on the difference between the calculated air-fuel ratio and a predetermined target air-fuel ratio.
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Accused Products
Abstract
In an exhaust system, a first oxygen sensor is attached to an exhaust pipe connected to a standard cylinder in which the amount of injected fuel is the closest to the average of the amounts of fuel injected in a plurality of cylinders. A controller calculates the air-fuel ratio of the standard cylinder based on the value detected by the first oxygen sensor. Then, based on the difference between the calculated air-fuel ratio of the standard cylinder and a predetermined target air-fuel ratio, the amount of correction to the amount of fuel injected in the standard cylinder is determined such that the air-fuel ratio of the standard cylinder is equal to the target air-fuel ratio. Furthermore, based on the amount of correction to the amount of fuel injected in the standard cylinder, the amounts of correction of the other cylinders are determined.
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Citations
8 Claims
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1. An exhaust system for exhausting gas from a plurality of cylinders of an engine, the exhaust system comprising:
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a plurality of first exhaust pipes corresponding in number to the plurality of cylinders, into which the gas exhausted from the plurality of cylinders flows, respectively; a first catalyst device having a first catalyst that cleanses the gas introduced from the plurality of first exhaust pipes; a first assembler arranged to assemble and couple first ends of the plurality of first exhaust pipes to the first catalyst device; a plurality of first inflow portions provided at the first assembler that allow the gas exhausted from the plurality of first exhaust pipes to flow into the first catalyst device; a first detector provided in only one of the plurality of first exhaust pipes or only one of the plurality of first inflow portions and arranged to detect the information about an oxygen concentration of the gas exhausted from only a respective one of the plurality of cylinders; and a controller that controls the amounts of fuel injected in the plurality of cylinders, based on the information about the oxygen concentration detected by the first detector;
whereinthe first assembler is connected to the first catalyst device such that the plurality of first inflow portions are not in communication with each other; the first exhaust pipe or the first inflow portion provided with the first detector is connected to the cylinder in which the amount of injected fuel is the closest to an average of the amounts of fuel injected in the plurality of cylinders; and the controller calculates the air-fuel ratio in the cylinder in which the amount of injected fuel is the closest to the average amount based on the information about the oxygen concentration detected by the first detector, and controls the amounts of fuel injected in the plurality of cylinders based on the difference between the calculated air-fuel ratio and a predetermined target air-fuel ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification